The HA5 4 postcode sector stands on the Greater London and Hertfordshire border in the Greater London area of England..
HA5 4 is a postcode sector within the HA5 postcode district which is within the HA Harrow postcode area.
The Royal Mail delivery office for the HA5 4 postal sector is the Pinner Delivery Office.
The area of the HA5 4 postcode sector is 1.37 square miles which is 3.55 square kilometres or 878.07 square acres.
Waterways within the HA5 4 postcode sector include the Pinn.
The HA5 4 postcode sector is crossed by a railway.
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